head,body,div,iframe,p,table{
    margin:0;
    padding:0;
}
html,body{
    overflow: hidden;
}
.full-bg{
    display: block;
    position: relative;
    float: left;
    width: 100%;
    height: 100vh; /* 使用视窗高度 */
    background-image: url('https://ai-public.mastergo.com/ai/img_res/d5a11f0ea9bd6d7912901a941daed03c.jpg'); /* 设置背景图片 */
    background-size: cover; /* 或者使用 '100% 100%' */
    background-position: center; /* 确保图片居中 */
}
input,select{
    border: .5px solid #DDDDDD;
}
button{
    border-radius: 5px;
}